Device for the distant transmission of orders



May'ZO, 1930. R. MERCIER 1,759,318

DEVICE FOR THE DISTANT TRANSMISSION OF ORDERS Filed July 11, 1929 2 Sheets-Sheet 1 Q 912 h3g4 firm/m4 B87712, Merclel" WW mam i/ May 20, 1930. R. MERCl ER 8 DEVICE FOR THE I JIS'IAN'I TRANSMISSION OF ORDERS Filed July 11, 1929 2 Sheets-Sheet 2 Fig.5 7 Fig.6

' WWW Be 716' Mere L'er' Patented May 20,1930

UNITED STATES titans use MERCIER, on minis, FRANCE, nssrenon r n rnnmssnivinnrs AEBA, of

- PARIs, FRANCE DEVICE non ma nIsrANr mainstream or 03mins Application filed .nn'y 11, 1529, Serial No. 377,554, and in rr'aii August 1, 15a.

The problem of distant transmission of orders or of any indications or signals, the practical uses of which are many, hasalready suggested numerous devices.

5 While pre'ciseand complete, electrical methods utilizing a subservient motor, are 1ntri cate and too expensive in a number of cases. For certain uses, where so great a degree of accuracy is not required or where transmission to a short distance only is desired, various simple mechanical methods have been proposed. Awkward in practice tor transmission to a plurality of stations, they are deficient in responsivity.

5 The hydraulic method which the present invention involves combines with the utmost simplicity of mechanical devices, great installation facilities and ready adaptation to multiple stations. It is usable for the transmission of orders or of indications of any character. I

The invention consists essentially in hydraulically transmitting a pressure exerted on a central vessel or reservoir to any numher or identical manometers, one of which serves as a telltale for'the operator.

The assemblage of devices and pipingconstitutes a tight enclosure completely filled with incompressible liquid and, therefore, a

pressure exerted at one point will be transmitted to all the points throughout the enclosure so long as the liquid retains its fluid properties.

In this manner all possible errors due to temperature, to exterior pressure, etc. are

eliminated. As a matter of fact, if, consequent upon a rise in temperature, the opera.- tor perceives that the pointer of the telltale manometer is no longer at zero, he has merely 40 to restore the pressure within the enclosure to its initial value by regulating'the transmitting capacity in order that all the manometers will return to their Zero position@ To any given pressure within the system corresponds one position, and onlyone, of the pointers of the manometers. As will be apparent, application of the system can be extended to any number of receivers and of transmitters on one and the same system of piping.

In the accompanying drawingsz n k Figure I is a diagrammatic view, with s in section, of a hydraulic transmitter coinprising a pressure regulating device for the liquid contained in the piping system;

Figs. 2 and 3 show two modified forms-or signalling box; I c

Fig. i is a dia rammatic iew of daydrealic transmitter with a" central, double control; I i c F 5 shows a transmitter for multiple signal stations, each of them capable otheing isolated from the column of liquid 5 Fig. 6 shows the use of .the signalling system with a single piping between two operators. V

The device essentially comprises pressure transmitting resilient ve'ssel l connected through pipingwith any number of manometers', such as 10, 11, 12, the wholeconstituting a tight enclosure or container completely filled with a suitably selected liquid.

As an example, the pressure sender may be constituted (Figure 1) by a rigid bo'XQ fitted at one end with a cover or lid 3. O n' the. other end of saidboir 2 there is soldered a diaphragm 4 provided with a rigid cover plate' 5. I w

From the latter end of the thus constituted and liquid-filled reservoir 8 leads ommbn piping 9 leading to the manometers 1Q, 11mm 12 the manometer 1Q serving as a telltale for the operator, andthe other two 11, 12 asjre ceivers of emitted signals. Through cover 3 passes a screw 6 adapted to bear, at its tip on plate 5 and the other end of which is provided with a crank or with a pusher 7, When the crank is operated, the screw tip is caused to presson diaphragm 4. I I y r I The inside pressure-is thereby increased, resulting in a shifting of all the manometer pointers. Pressure on vessel Smight also be obtained, instead of mechanically, through some fluid compressed bymeans .of an ex terior pump (not shown) in the space be $5 tween vessel 8 and box 2, which'boX isfreii dered tight, 7 i I W The liquid, contents confined withi'n'the tight enclosure may be under anyinitial pres sure without the arrangement or device cha'r ationsor with both.

Y acteristic of the invention being modified; the V only requirement being that all the manometers be caused to give one and the same indication or any one and the same inner pressure.

i In order to facilitate filling or adjustment,

or in order to assist in compensating temperature and to avoid exaggerated motions of the control lever when the temperature varies much, I provide on the piping an auxiliary resilient vessel 13.

Vessel 13 may also be used for making calls, as, for instance, by means of a lever such as 14 exerting a pressure thereon.

The travel of screw 6 may be limited by any suitable means, say by the length of the threaded part thereof, in view of avoiding exaggerated distortions of the pressure vessel 8.

Figure 2 shows a modification of the device illustrated by Figure 1, with control bya lever instead of by a screw. 7

Figure 3 represents another modification in which the resilient diaphragm 4 is initially set by a spring 15 in view of altering the point of resilient operation of the diaphragm or in order to assist refilling and adjustment.

Themanometers or gauges may be of any sort, or of the diaphragm or the tube type; theyare fitted with identical dials marked either With control indications or with gradu- The invention iscalculated to solve problems as to transmission.

. As an example, Figure 4 shows a central, double control; the operator may operate the two hereinbefore described pressuretransmitters 1 and 1, one of which transmits directions andthe other the figures of a graduation. The indications transmitted through .two different pipingsq9 9. are received by two manometers 11, 12, preferably byQmanometers having two concentric pointers, one of said manometers serving as a telltale and fitted with a dial marked with double indications.

Such a device is useful in aerial navigation where a pilot has to be telegraphed commands and angles for course-trueing or correction of course for drift by means of apparatus of reduced size. I

A, cook 16 may be provided on the piping for maintaining. the angle reading or indication, for instance, for as long as it is desired to have it remain before the pilots sight (manometer-11) while leaving the command transmission available. Figure 5 represents a diagram of a transmission from the main or central transmitter 1 tovarious stations 30, 31, 32through separated pipings which can be isolated by cocks 20, 2 1', 22.

Figure 6 applied to cross-telegraphing of signals through a single piping between two operators at different stations 17. v p

is a diagram showing the device I claim as my invention: 1. A hydraulic telegraphfor the distant transmission of signals, comprising a closed system filled with liquid and embodying piping, a pressure transmitter communicating -with said piping and acting in liquid-tightmanner on the liquid, and indicating ma nometers branched on the piping to receive the pressure impulses transmitted through the liquid by the transmitter.

' 2. A hydraulic telegraph according to claim 1, in which the pressure transmitter contractible diaphragm therewithin secured atone end to the box and having a rigid closure plate at the other end, the first-named end communicating with the interior of the piping through an orifice in the adjacent wall of the box, and means for varying the vol umet-ric' capacity of the diaphragm.

3. A hydraulic telegraph according to claim 1, in which the pressure transmitter comprises a closed box, an expansible and contractible diaphragm therewithin secured at one end to the box andhaving a rigid comprises a closed box, an expansible and closure plate at the other end, the first-named end communicating with the interior of the piping through an orificein the adjacent wall of the box, and a member mounted for endwise movement in said box and bearing at its tip against said closure plate to vary the volumetric capacityof the diaphragm.

4:. A hydraulic telegraph according to claim 1. in which the pressure transmitter comprises a closed box, an expansible and contractible' diaphragm'therewithin secured at one end to the box and having a rigid closure plate at the other end, the first-named end communicating with the interior of the piping through an orifice in the adjacent wall of the box, andv an endwise-movable screw mounted in said box for exerting pressure.

on the closure plate of the diaphragm to vary the volumetric capacity of the latter.

5. A hydraulic telegraph according to claim 1, in which the pressure transmitter 7 comprises a closed box, an expansible and contractible diaphragm therewithin secured at one end to the box and having a rigid closure plate at the other end, the first-named 

